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anhha310709
2 năm trước
câu 1 :Cho Ox và Oy là hai tia đối nhau. Trên tia Ox lấy điểm A sao cho OA = 4 cm, Trên tia Oy lấy điểm B sao cho OB = 3 cm. a) Tính độ dài đoạn thẳng AB. b) Trên cùng một nửa mặt phẳng bờ là đường thẳng xy vẽ hai tia Oz và Ot sao cho xÔz=120 độ ,yÔt=30 độ . Chứng minh Ot là tia phân giác của yÔz
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